how would you demonstrate that light is necessary for photosynthesis
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To prove the necessity of sunlight in photosynthesis following steps need to do
Take a plant with destarched leaf.
Leaf is partially covered with black paper on which a design is cut.
Expose this plant to sunlight for few hours and perform a starch test with iodine solution.
OBSERVATION
Covered leaf part shows brown colouration.
Exposed leaf shows blue-black colour.
RESULT
Starch is present in the exposed leaf.
CONCLUSION
Leaf exposed to sunlight give iodine test, proving that sunlight is necessary for photosynthesis.
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